桂糖甘蔗新品系黑穗病抗性鉴定及结果分析

防治甘蔗黑穗病最有效的途径是种植抗病品种,而评价甘蔗抗黑穗病是抗病品种选育过程中重要程序。本研究对广西农科院甘蔗研究所选育的8个桂糖甘蔗新品系进行人工浸渍接种甘蔗鞭黑粉菌混合冬孢子悬浮液,同时调查大田自然发病情况,收集一新一宿黑穗病发病情况。 ROC22号为对照品种,综合评价桂糖甘蔗新品系对黑穗病的抗性。结果表明：抗性类型为抗病的品系有2个,分别为桂糖12-765和桂糖12-2262。抗性类型为中抗的品系有2个,分别为桂糖12-2476和桂糖12-2004。抗性类型为中感的品系有1个,为桂糖12-162。抗性类型为感病的品系有3个,分别为桂糖12-762、桂糖12-2425和桂糖12-917。对照品种ROC22的综合抗性类型为感病。对比人工接种和自然发病结果,人工接种黑穗病更准确评价甘蔗品种抗黑穗病的水平,为选育高产高糖高抗黑穗病甘蔗品种提供依据。

Smut Resistant Identification and Analysis of New Sugarcane Clones of Guitang

The most effective way to control sugarcane smut is to plant resistant varieties. The evaluation of resistance to sugarcane smut is a very important procedure in the breeding of resistant varieties. In order to evaluate the resistance to smut of the eight new sugarcane clones bred by Sugarcane Research Institute of Guangxi Academy of Agricultural Sciences, the suspension of mixed Sporisorium scitamineum was inoculated to the new clones to obtain the incidence, also the natural incidences of smut in the field were investigated. The investigation period included new planting and first ratoon of sugarcane. ROC22 was used as the control. The results showed that GT12-765 and GT12-2262 were resistant to smut; the clones GT12-2476 and GT12-2004 were moderately resistant; GT12-162 was moderate susceptible; GT12-762, GT12-2425 and GT12-917 were susceptible to smut; and the CK (ROC22) was susceptible. The artificial inoculation could be used to more accurately evaluate the resistance to sugarcane smut, compared to the natural infection. The results of this study would provide a basis for breeding sugarcane varieties with high resistance to smut.